Qt 6.5.3 fails to build examples on Debian 12

alik_co

I have default installation of Qt 6.5.3 on Debian 12.
Note: to start QtCreator, had to apt-get install libxcb-cursor0.

Attempt to configure an example ~/Qt/Examples/Qt-6.5.3/widgets/painting/basicdrawing fails:

~/Qt/6.5.3/gcc_64/lib/cmake/Qt6/Qt6Config.cmake
but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT FOUND. Reason given by package:
Failed to find required Qt component "Gui"
Expected Config file at
"~/Qt/6.5.3/gcc_64/lib/cmake/Qt6Gui/Qt6GuiConfig.cmake" exists

However, "~/Qt/6.5.3/gcc_64/lib/cmake/Qt6Gui/Qt6GuiConfig.cmake" does exist.

Any advice is highly appreciated. Thanks!

Axel Spoerl

That's a bug unfortunately.
I can reproduce it on 6.5.5, while 6.6.1 works.
As a workaround you can try building it with qmake instead of cmake.

cristian-adam

You need to provide more information. Something is missing for the Gui component to be declared as found. The presence of Qt6GuiConfig.cmake doesn't necessarily mean that the Gui component is Ok.

CMake's --debug-find or --trace-expand parameters will provide more CMake tracing in order to find out what's missing.

alik_co

@cristian-adam said in Qt 6.5.3 fails to build examples on Debian 12:

cmake --debug-find

Couldn't find /usr/share/cmake-3.25/Modules/FindQt6.cmake. In fact, this file doesn't exist at all, I scanned the whole system. Looks like installer bug. I'm guessing because it's Debian, not Ubuntu. Is there a way to get this file? I could copy it and see what happens

alik_co

@Axel-Spoerl Thanks, qmake worked.

Can I copy FindQt6.cmake file from somewhere?
Since this is a known issue, may I have a link to the tracking bug?

Axel Spoerl

@alik_co @cristian-adam
It boils down to qt_add_* not being found. I’ll report the bug tomorrow with all details.

Axel Spoerl

This ticket contains some information I have reproduced.
Could you run CMake (qt-cmake6) as @cristian-adam suggested and add --trace-expand --trace-redirect=cmake.trace.
Thereafter, please post the cmake.trace file here (between code tags for formatting) - thanks.

alik_co

@Axel-Spoerl Will do later this week. Thanks for your attention

alik_co

@Axel-Spoerl There is no file qt-cmake6 on the the system. Could you please show me exact command line to run, from which directory.

Just in case if this matters: at the time of Qt installation, I did not have installed on the system:

libxcb-cursor0
mesa-common-dev
libglu1-mesa-dev
gdb

jsulm

I don't have Qt6 at hand to check but you can simply search for the cmake executable in your Qt installation:

find ~/Qt/6.5.3/gcc_64 -name "*cmake*"

alik_co

@Axel-Spoerl Since there is no qt-cmake6 on my machine, I simply ran cmake for the example with enabled tracing.
Here is the whole thing: https://drive.google.com/file/d/16HMlyWeO6VLBiAIJLMd5FP_-PoWzRY8k/view?usp=sharing
BTW, is there a way to attach files here?

alik_co

@jsulm Of course I have cmake executable, otherwise there wouldn't be any discussion at all. The question was about qt-cmake6, which looks like not available in community edition.

jsulm

@alik_co said in Qt 6.5.3 fails to build examples on Debian 12:

The question was about qt-cmake6, which looks like not available in community edition.

That's why I suggested to search for it in your Qt installation...

alik_co

@jsulm I scanned the whole system recursively from '/'. qt-cmake6 is not there. (of course there is tons of *cmake*)

jsulm

@alik_co Well, I did not suggest to scan whole system...

Axel Spoerl

@alik_co said in Qt 6.5.3 fails to build examples on Debian 12:

I have default installation of Qt 6.5.3 on Debian 12.
Attempt to configure an example ```~/Qt/Examples/Qt-6.5.3/widgets/painting/basicdrawing`` fails:

If ~/Qt/6.5.3/gcc_64/bin/qt-cmake doesn't exist, you have used the installer to install examples, but you haven't installed Qt 6.5.3.
If you launch Qt Creator, does it show a compile kit for 6.5.3?

alik_co

@Axel-Spoerl Yes the kit is available. As I mentioned at the beginning, qmake projects work just fine, Qt is definitely installed. qt-cmake does exist, there is no qt-cmake6.
qt-cmake and then make successfully built basicdrawing. But QTCreator still fails to open cmake project, qmake works fine.

alik_co

@Axel-Spoerl Complete re-install didn't help. As before, qmake projects work fine, but any cmake fails.

jsulm

@alik_co What CMake executable is configured in QtCreator?

Axel Spoerl

Well, and since Creator gets the build toolchain from qmake:

Edit->Preferences->Kits
select "Qt Versions" tab
select your Qt version ("Desktop Qt 6.5.3 GCC 64bit")
what is the "qmake path:"?